Explanation:

- Order 48, Rule 3: This relates to the use of forms in legal appendices. These ensure uniformity and clarity in legal documentation.

- Correct Answer: Option 1, Order 48, Rule 3

- Order 31, Rule 9: Pertains typically to procedures involving guardians of minors or persons of unsound mind in a legal context.

- Order 22, Rule 18: Generally deals with procedures after the death of a plaintiff or defendant, including substitution or abatement of legal proceedings.

- Order 16, Rule 10: Concerns the summoning and attendance of witnesses in court proceedings.